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chapter12 - b Spicules c Archaeocytes 5 Choanocytes 6...

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Chapter 12 I. Kingdom Animalia    A. Multicellular animals (metazoa) divided into three “grades” 1.   Mesozoa 2.   Parazoa 3.   Eumetazoa II. Phylum Mesozoa  III. Phylum Placozoa   IV. Phylum Porifera A.   Sessile, aquatic (mostly marine) B.   no true tissues C.   Range in size from several mm to 2+ m in diameter D. Structure and function  1.   Body form— a) Asconoid b) Syconoid c) Leuconoid 2. Structures a)  Spongocoel b)   Ostia
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c)   Osculum 3.   Pinacocytes 4.   Mesohyl a)     Spongin
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Unformatted text preview: b) Spicules c) Archaeocytes 5. Choanocytes 6. Reproduction a) Asexual (1) Gemmules (2) regeneration b) Sexual E. Classification 1. Class Calcarea a) Asconoid, syconoid, or leuconoid 2. Class Hexactinellida—siliceous a) Syconoid and leuconoid forms 3. Class Demospongiae—siliceous a) leuconoid b) Includes commercial bath sponge F. Phylogeny and adaptive radiation 1. Origin 2. Diversity...
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chapter12 - b Spicules c Archaeocytes 5 Choanocytes 6...

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